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1.62除以括号20.4%9.6括号乘0.3

1.62÷(20.4-9.6)×0.3 =1.62÷10.8×0.3 =0.15×0.3 =0.045

320%乘以括号1-括号1/4+1/6括号括号乘以9/2等于多少 解: 320%×[1-(1/4+1/6)]×9/2 =16/5×(1-5/12)×9/2 =16/5×7/12×9/2 =42/5

解: (5/6+2/9)×4/5÷19/20 =(5/6+2/9)×4/5×20/19 =19/18×4/5×20/19 =8/9

15:20=3/4=6:8=9:12

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